that's really horrid!
sorry to hear!
I'm suprised b/c I live in a very horse-y and coyote filled area. They almost comingle in the pasture turn-outs. They've never attacked (coyotes to horses), but they hang around them b/c they stir up rabbits and other small animals living in the brush.
I hear them "howl" near-nightly and it's just....freaky